Nuclear reactor shutdown system

摘要

To provide a reactor shutdown system (47) that can shut down a reactor (5) by various means in an event of a malfunction in a nuclear facility.
A reactor shutdown system (47) that stops nuclear reaction in a reactor (5) in the event of a malfunction in a nuclear facility that includes a reactor (5), a control-rod drive unit (17) that can drive a control rod (16) in pulling and inserting directions with respect to a fuel assembly (15), a power source (31) that can supply power to the control-rod drive unit (17), and a power converter (32) that is provided between the control-rod drive unit (17) and the power source (31), in which when power supply is cut off, the control-rod drive unit (17) inserts the control rod (16) into the fuel assembly (15) to stop nuclear reaction in the reactor (5), and the reactor shutdown system (47) includes a reactor trip breaker (45) provided between the power converter (32) and the control-rod drive unit (17), a safety protection-system device (43) that controls the reactor trip breaker (45) to cut off power supply to the control-rod drive unit (17), and an auxiliary stop-control (CCF) device (44) that controls the power converter (32) to cut off power supply to the control-rod drive unit (17).